1962 Booster has a "T" for an inlet with 1 arm going to engine vacuum and other going to the reservoir can. Yours looks late model with some kind of sensor. Master cylinder looks like a aftermarket replacement. Previous owner may have plugged can inlet to keep dirt and moisture out incase they wanted to use it at a later date. (I did.) If the booster is working and it is only temporary I wouldn't worry about the hiss. I used a Master Power Brakes booster with a Rock Auto dual master cylinder.
|